Hach DR/850 - Page 19

19
CHEMICAL ANALYSIS INFORMATION, continued
Table 4 Required Containers, Preservation Techniques and Holding Times
1
Parameter No./Name Container
2
Preservation
3,4
Maximum Holding Time
5
Table 1A - Bacterial Tests:
1-4. Coliform, fecal and total P,G Cool, 4°C, 0.008%, Na
2
S
2
O
3
6
6 hours
5. Fecal streptococci P,G Cool, 4°C, 0.008%, Na
2
S
2
O
3
6 hours
Table 1B - Inorganic Tests:
1. Acidity P, G Cool, 4°C 14 days
2. Alkalinity P, G Cool, 4°C 14 days
4. Ammonia P, G Cool, 4°C, H
2
SO
4
to pH<2 28 days
9. Biochemical oxygen demand (BOD) P, G Cool, 4°C 48 hours
11. Bromide P, G None required 28 days
14. Biochemical oxygen demand,
carbonaceous
P, G Cool, 4°C 48 hours
15. Chemical oxygen demand P, G Cool, 4°C, H
2
SO
4
to pH<2 28 days
16. Chloride P, G None required 28 days
17. Chlorine, total residual P, G None required Analyze immediately
21. Color P, G Cool, 4°C 48 hours
23-24. Cyanide, total and amenable to
chlorination
P, G Cool, 4°C, NaOH to pH>12, 0.6
g ascorbic acid
6
14 days
7
25. Fluoride P None required 28 days
27. Hardness P, G HNO
3
to pH<2, H
2
SO
4
to pH<2 6 months
28. Hydrogen ion (pH) P, G None required Analyze immediately
31, 43. Kjeldahl and organic nitrogen P, G Cool 4°C, H
2
SO
4
to pH<2 28 days
Metals:
8
18. Chromium VI P, G Cool, 4°C 24 hours
35. Mercury P, G HNO
3
to pH<2 6 months
3, 5-8, 12, 13, 19, 20, 22, 26, 29, 30, 32-
34, 36, 37, 45, 47, 51, 52, 58-60, 62, 63,
70-72, 74, 75.
9
Metals, except boron,
chromium VI and mercury
P, G do 6 months
38. Nitrate P, G Cool, 4°C 48 hours
39. Nitrate-nitrite P, G Cool 4°C, H
2
SO
4
to pH<2 28 days
40. Nitrite P, G Cool, 4°C 48 hours
41. Oil and grease G Cool, 4°C, HCl or H
2
SO
4
to
pH<2
28 days
42. Organic Carbon P, G Cool, 4°C, HCl or H
2
SO4 or
H
3
PO
4
to pH<2
28 days
44. Orthophosphate P, G Filter immediately; Cool, 4°C 48 hours
46. Oxygen, dissolved probe G Bottle and
top
None required Analyze immediately
47. Winkler G Bottle and
top
Fix on site and store in dark 8 hours